The Tax Policy Center has released Distribution of the 2001-2006 Tax Cuts:

The following tables show Tax Policy Center estimates of the combined effect of the major tax changes that have been enacted since 2001. For each table, we compare the amount of tax that is owed under current law with the amount that would have been paid if the law had stayed the same as it was in 2000. The estimates are computed both for dollar income classes (e.g., $40,000 to $50,000) and for percentiles of the income distribution (e.g., middle quintile, which includes households in the middle 20 percent of the income distribution).